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Novel Access to Propagation Rate Coefficients of Radical Polymerization by the SP–PLP–EPR Method
Author(s) -
Kattner Hendrik,
Drawe Patrick,
Buback Michael
Publication year - 2015
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201500191
Subject(s) - electron paramagnetic resonance , monomer , chemistry , polymerization , radical polymerization , analytical chemistry (journal) , aqueous solution , laser , polymer chemistry , photochemistry , nuclear magnetic resonance , polymer , optics , organic chemistry , physics
A novel method for k p measurement is presented, in which time‐resolved electron paramagnetic resonance detection of radical concentration after applying a single laser pulse (SP−PLP−EPR) is carried out in conjunction with measuring monomer conversion induced by the laser pulse. The method is particularly useful for the study of fully ionized monomers, as will be outlined by experiments on trimethylaminoethyl methacrylate chloride (TMAEMA, 2‐(methacryloyloxy)‐ N , N , N ‐trimethylethan‐1‐aminium chloride, 20 wt% in aqueous solution) at 60 °C. In addition to k p , the method provides termination rate coefficient data. The reliability of the so‐obtained rate coefficients is demonstrated by chemically induced experiments and by measuring TMAEMA conversion after single‐pulse initiation via near‐infrared (NIR) spectroscopy.